Separator



T. i. STURTEVANT.

SEPARATOR.

APPLICATION FILED. NOV. 30, 19I8.

Patented Nov. 30, 1920.

2 SHEETS-SHEET I.

v Invenzvrr T. J. STURTEVANT.

SEPARATOR.

APPLICATION FILED NOV,30.1918.

Patented. Nov. 30,1920.

2 SHEETS-SHEET 2.

JnT enz UNITED STATES PATENT OFFICE.

THOMAS J. STURTEVANT, OF WELLESLEY, MASSACHUSETTS, ASSIGNOR TO STURTEVANT MILL COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OF MASSACHU- SETTS.

SEPARATOR.

To all whom it may concern Be it known that I, THOMAS J. Srnnrnwear, a citizen of the United States, residing at .Vellesley, in the county of Norfolk and State of Massachusetts, have invented an Improvement in Separators, of whichthe following description, in connection with the accompanying drawings, is a specification, like characterson the drawings representing like parts.

The invention to be hereinafter described relates to separators for grading materials, and more particularly to improved means for vibrating the screens of the separator.

In my copending application, Serial No. 218,649, filed February 23, 1918, is shown, described and claimed a mechanism for vibrating the screen of a separator comprising an arm having one end fulcrumed in an open bearing on a bracket on the casing of the separator, and carrying a hammer adjacent the free end of the arm for imparting blows to a pin projecting through the cover of the casing toward the screen. An actuator is provided comprising a pair of arms projecting from a boss on a rotary shaftmounted in hearings on the casing, the construction of said arms being such that when rotated,

they can reach in under the free end of the hammer arm a substantial distance and lift the arm and hammer and then drop the same to allow the hammer to impart its blows to the pin.

This is a good, eflicient mechanism for the purpose, but an actuator must be provided for each one of the hammer arms. the objects of the present invention, therefore, is to provide a hammer mechanism comprising a plurality of arms and hammers for striking a plurality of pins, the construction being such that a single actuator may serve to elevate all of said arms. As a consequence, the vibrating mechanism is desirably simplified, and the materials and labor essential to the manufacture thereof are reduced. Also, the construction is standardized so that single or double hammers may be used alternatively as desired.

Another object of the invention is to provide a socket for the lower end of the pin which transmits the blows from the hammer to the screen, constructed and arranged to have a tight friction fit with the pin, so that normally the pin will vibrate with the socket, but when it is desired to open the cover of the One of Specification of Letters Patent. Patented N 30, 192() Application filed November 30, 1918. Serial No. 264,852.

casing to furnish access to the screens there in, the pin may be carried by it out of the socket automatically.

.VV'th the aforesaid and other objects in view,the character of the invention will be best understood by-reference to the following description ofone good form thereof shown 7 in the accompanying drawings, wherein v Figure l is a vertical longitudinal section showing a portion of a separator equipped with screen vibrating means embodying the invention; and

Fig. 2 is a perspective view of a portion of the separator equipped with the vibrating means.

Referring to the drawings, the vibrating means may be applied to various forms of separators, but in the present instance, it is illustrated in connection with a separator similarto that shown, described and claimed in my copending application, Serial No. 261,347 ,filedNovember 6, 1918, and comprises an inclined casing having a bottom 1, sides 3 and. a cover 5 having its upper end connected by hinges 7 with the body of the casing. The materials to be graded are delivered to the screen or screens in the casin" by a feedbox or trough, a portion of whic isindicated at 9. i

i The separator may be provided with one or more screens for grading materials, but in the present instance, it is equipped with a coarse or scalper screen comprising screen clothing 11 stretched on a frame 13 mounted on hanger plates 15 secured to and depending from the hinged cover 5. Beneath the coarse or scalper screen is a master frame comprising side plates 17 connected by lower transverse bars 19 and upper transverse bridge bars 21. The master frame may carry one or more fine screens, in 'thefpresent instance, two such screens beingshowmeach comprising screen clothing 23 having 0pposed margins 25 having angle bars27 'sf cured. thereto and provided with outwardly inclined flanges connected to the side plates of the master frame by bolts 29. The construction is su h that the bolts may be adjusted to give the screens the tension desired, and the flanges 27 may be pressed against the side plates of the master frame to prevent escape of material from the upper surfaces of the screens to the side plates of the master frame. The master frame may be lift mounted on leaf springs 31 secured to the upper edges of longitudinal bars 33 resting on the bottom of the casing.

The construction thus far described may be substantially the same as that disclosed in my said copending application, and therefore, further illustration and description thereof herein will be unnecessary.

Next will be described the improved means for vibrating the screens. This means, in the present instance of the invention, comprises an arm 35 preferably of resilient material having a hammer 37 secured thereto adjacent one end thereof. The opposite end of the arm may be con nected by rivets 39 or other suitable securing means to a flat bar 41 or equivalent member having a rounded edge as serving as a fulcrum for engagement with the bottoms of open bearings 45 on a bracket. having a 47 connected by bolts 19 or other suitable means with the cover 5 of the casing.

A pair of arms 51 preferably of resilient material have free ends connected by a U-shaped bridge member 53 provided with a hammer 55, in the present instance, formed integral with said member. The construction is such that the arms 51 may be in substantially the same plane as the arm 35, and the active striking ends of the hammers 37 and 55 may be at substantially the same distances from'said plane. The opposite ends of the arms 51 are connected by rivets 57 or other suitable securing means with the fulcrum bar 41, and preferably all of the arms 35 and 51 are secured to the bar ll between the fulcrum bearings 45 for said bar.

'A suitable actuator may be provided for intermittently lifting and dropping the hammers. In the present instance, this actuator comprises a pair of curved arms 59 projecting from a split boss 61, the parts of which are clamped by bolts to a shaft journaled in hearings in brackets, such, for example, as the bracket 67 mounted on the top of the cover of the casing. A sprocket wheel 68 is mounted fast on the shaft 65 and driven by a sprocket chain 67 from any suitable source of power.

The construction is such that in the course of the rotation of the actuator arms 59, they will reach in under the free end of the ham- .mer arm 35 and rock the same upward un mit the blows from the hammers to the screens. In the present instance of the invention, the blows from the hammer 37 are imparted to the master frame carrying the fine screens by a pin 69 of wood or other suitable material. havin a tapered end 71 to receive the biows of the hammer and prevent splitting of the pin. The pin projects downward through the cover of the casing and through the scalper screen toward one of the bridge bars 21 of the masster frame. Mounted on this bridge bar is a socket member having a base plate 73 and a socket 75 tapered to receive the lower tapered end 77 of the pin. The construc tion is such that the tapered end of the pin may be driven into the tapered socket and have a tight friction fit therein, so that normally the pin will. vibrate with the socket. The socket may be split to allow the escape therefrom of any dust which might-enter therein and prevent the pin from entering the socket with its tight friction fit.

It is desirable that the pin be lifted with the cover up away from the master frame when the cover is opened. To complish this, the pin may be provided with a cotter pin 79 entered through a hole in said pin somewhat above the upper surface of the cover. When the cover is opened, it will engage the cotter pin and thereby pull the hammer pin up out of the socket 7 5. "When the cov is lowered again, the hammer pin will return to the socket and the blows of the hammer on the pin will again secure the same into the socket 'with a tight friction fit.

To guide the hammer pin, the cover may be provided with a plate 81 having a neck 83 projecting therefrom through hole in the cover, and sufficiently large to loosely receive the hammer pin. To guide the hammer pin in its passage through the scalper screen and prevent escape of material. to be graded through the hole in the scalper screen, a plate 85 may be mounted on the scalper screen and secured by rivets to a ribbon'strip 87 beneath the scalper screen and extending longitudinally thereof. A neck 89 projects up from the plate 85 and has an internal diameter sufiiciently large to allow the hammer pin to pass freely therethrough. The neck 89 shoind be of suflicient height to prevent the material flowing along the upper surface of the scalper screen from passing "down through the neck.

Suitable means may be provided to transmit the blows from the hammer 55 to the scalper screen. For this purpose, a pin 91 may be provided similar to the hammer pin already described, but shorter than the latter. The hammer pin 91 has a tapered end secured with a tight fit in a split socket 95 conveniently mounted on the same plate 85 which carries the neck 89 for the hammer pin 69. J1 neck 97 may guide the hammer pin 91 in its passage through the cover, and may be conveniently formed'integral with the plate 81 for the neck 83 referred to, for the hammer pin 69.

In operation, the actuator will intermittently lift and drop the hammers, thereby allowing the same to impart blows to the pins, which will transmit the blows to the seal per screen and to the master frame. The vibrations thus produced in the master frame will be transmitted through said frame to the screens carried thereby and eliiciently vibrate the same.

As stated the arms for the two hammers are preferably of resilient material. As a consequence, they may be susceptible of more or less relative rocking movement, so that if one of the hammers should strike its pin before the other, it will not'interfere with the production of effective blows by both hammers on the pins. The fulcrum bar 41 may be readily inserted in the open bearings in the bracket mounted. on the cover, and since the hammer arms incline downwardly and carry their hammers beneath said fulcrum bar, the weight of the parts will be sufficient to maintain. the fulcrum bar properly seated in its bearings. If it is desired to employ merely one screen in the casing, or to omit the scalper screen from the casing, an arm having one hammer may be readily substituted for the arms carrying two hammers. Thus, a standardized construction is provided which simplifies and cheapens the cost of manufacture, and enables one or more screens to be used in the casing of the separator according to conditions as required.

The arms for the hammers shown herein constitute one good form of carrier for the hammers, but obviously, other forms might be adopted if desired. 7

Having described one good form of the invention without limiting the same thereto, what I claim as new and desire to secure by Letters Patent is l. In a separator, the combination of a casing having a cover, upper and lower screens for grading materials mounted in said casing, a bracket having an open bearing mounted on said cover, a member fulcrumed in said open bearing, a pair of arms connected to said member, hammers carried by said arms, a pin to transmit blows from one of said hammers to said upper screen, a pin extending through said upper screen toward said lower screen to transmit blows from the other hammer thereto, and rotary actuating means mounted on said cover for intermittently lifting said hammer means and dropping the same onto said pins.

2. In separator, the combination of a casing, a pair of screens for grading materials mounted in said casing in superposed relation, a bearing member, a member ful crumed in said hearing member, a pair of arms secured to said fulcrumed member, hammers carried by said arms, pins of un erpial lengths to transmit blows from said hammers to said'screens, and means interinittently to lift and drop said arr s and hammers to cause the latter to impart blows to said pins.

screens for grading materials, a rocking bar,

separate resilient swinging arms rigidly secured to the common rocking bar and ar ranged to have the movement of one arm impart a similar movement to another arm and in the same direction, hammers secured to said arms, pins arranged to receive blows from said hammers and transmit the blows to said screens, and. means operable upon one of said arms to raise and drop the same.

In a separator, the combination of screens for grading materials, hammers, carriers for said hammers arranged side by side and movable as a unit, pins between said hammers and screens, and rotating means for intermittently lifting and droppin said carriers to cause said hammers to impart blows to the pins and vibrate said screens.

6. In a separator, the combination of screens for grading materials, hammers, relatively movable members carrying said hammers in closely adjacent relation, pins located adjacent one another between said hammers and screens and a device for inte mittently lifting and dropping said hammer carrying members to cause said hammers to impart blows to said pins,

7. In a separator, the combination of screens for grading materials, hammers, swinging arms for said hammers secured together, pins between said screens and hammers, and means acting on one of said arms to lift and drop both of said arms to cause said hammers 0 strike said pins.

8. In a separator, the combination of a plurality of screens for grading materials, and means to vibrate said screens comprising a pair of hammers, arms for said hammers arranged side by side and having fulcrumed ends and relatively movable free ends, pins between said hammers and screens, and a device for lifting and dropping said arms to cause said hammers to impart blows to said pins.

9. In a separator, the combination of a plurality oi screens for grading materials, and means to vibrate said screens comprising a pair oi? adjacent pins, a pair of relatively movable hammers positioned to strike said pins, a carrier for said. hammers, and a device for intermittently lii ting and dropping said carrier to cause said hammers to impart blows to said screens.

10'. In a separator, the combination of a plurality of inclined screens for grading materials, and means to vibrate said screens comprising a support provided with an open bearing, a carrier fulcrumed in said open bearing and held therein by gravity, hammers o i said carrier, a rotary member for intermatently lifting and dropping said carrier, and pins between said hammers and screens to receive blows from said hammers and transmit the same toward said screens.

11. in a separator, the combination of a screen for grading materials, a split tapered socket above the screen, a pin having a tapered. end drlven tightly into said socket that the )in mav move with the socket and means including a hammer to impart blows to said pin to vibrate the screen.

12. In a separator, the combinationotl' upper and lower screens for grading materials, a member mounted on said upper screen hav ing a socket and a through hole, a pair of pins, one projecting through said hole toward the lower screen and the other projecting into said socket, relatively movable hammers positioned to strike the respective pins, and a pair of adjacent carriers for said hammers interconnected to have the movement of one carrier impart a similar movement to the adjacent carrier.

13. In a separator, the combination of a casing having a cover, a screen mounted therein for grading materials, a tapered socket above said screen, a pin having a tapered end normally secured with a friction t into said socket and an end projecting above said cover, means including a hammer to impart blows to said pin to vibrate the screen, and means on said pin for engagement with the cover automatically to pull the pin from its socket on opening of the cover.

In testimony whereof, I have signed my name to this specification.

THOMAS J. STURTIJVANT. 

